A digital asset is fungible when units defined as the same asset can substitute for one another; a non-fungible token is distinguished by its association with a particular item or position. For a tokenized real-world asset, that classification describes how token units relate to one another—not, by itself, who owns the underlying asset or what rights a holder can enforce. Those rights depend on the arrangement and applicable law.
What makes a digital asset fungible?
Fungibility is interchangeability among equivalent units. If units represent the same defined asset on the same terms, one unit can stand in for another without changing what the holder is entitled to receive. The key question is not whether two digital records look alike, but whether the asset and the terms they represent make the units equivalent.
A digital token can be understood as a ledger record about an asset and its owner, with programmable rules governing use or transfer. That definition describes a record and its rules; it does not establish that the recorded owner has legal title, or that the represented asset is valuable or enforceable as described. (source )
Interchangeability is also different from transferability. Fungibility asks whether units are substitutes for one another. Transferability asks whether, and under what rules, a unit can move between holders. A token’s programmable rules can govern transfer, but the fact that a token is fungible does not itself establish that it can be transferred in every context or that a transfer changes legal ownership.
To classify a token, first identify what one unit is defined to represent. Then ask whether another unit under the same arrangement represents an equivalent position on the same terms. The token rules and the surrounding arrangement matter: a shared visual design or ticker-like label is not enough to establish equivalence.
Fungible versus non-fungible tokens
A fungible token is designed around equivalent units. A non-fungible token (NFT) is distinguished from other tokens by its association with a particular item or position. This contrast concerns whether units are interchangeable, not whether one token is more valuable, higher quality, or more legally significant than another.
| Question | Fungible token | Non-fungible token |
|---|---|---|
| What is compared? | Units defined as the same asset on equivalent terms | Tokens associated with distinct items or positions |
| Can one unit substitute for another? | Yes, if the arrangement treats the units as equivalent | Not in the same unit-for-unit sense when each token identifies a distinct item or position |
| What does the classification establish? | Interchangeability of units within the defined context | Distinction between tokens within the defined context |
| What does it not establish on its own? | Legal ownership, redemption, or enforceability of an underlying asset claim | Ownership of associated content, physical property, or intellectual-property rights |
The table is a conceptual comparison, not a claim that every token labeled “fungible” or “NFT” has identical rules. The token record, associated materials, and governing arrangement can differ. A token’s uniqueness is also separate from the rights attached to it: an NFT transfer does not necessarily transfer the associated physical or digital asset or copyright rights in the underlying work. In the United States, those rights depend on applicable law and valid contracts, licenses, or other governing terms. (source )
What fungibility means for a tokenized real-world asset
A real-world asset arrangement may use token units to represent interests or claims. If its structure defines the units as equivalent, they may be interchangeable within that arrangement. But fungibility alone does not tell a reader what the interest or claim is, who owes an obligation, or how the underlying asset relates to the token.
A useful distinction is between the token record and the holder’s claim. The record can identify an asset and include rules for use or transfer, while the legal effect of those rules depends on the broader arrangement. A technical record does not, by itself, determine title or enforceability. (source )
Before interpreting a tokenized asset, identify what or whom the holder has a claim against and how any backing assets relate to that claim. Legal effect, segregation, redemption, and insolvency treatment depend on the arrangement and applicable law. (source ) The same token units may be technically interchangeable without proving that a holder has a direct ownership right, a right to redeem an asset, or an enforceable claim against a particular party.
NFTs illustrate the reverse distinction. A unique token may be associated with content or a physical item, but the associated rights can depend on terms and systems outside the token record. In the United States, NFT-associated rights and content remain dependent on applicable law, contractual terms, product transparency, and external systems beyond the token record. (source ) Thus neither fungibility nor uniqueness should be treated as a complete description of an asset’s legal or economic position.
Questions to check before interpreting a token
Use these questions to separate the token’s unit properties from the rights it may represent:
- What does one unit represent? Identify the defined asset, interest, or claim rather than relying only on the token’s name or appearance.
- Are units intended to be equivalent? Check whether the arrangement treats one unit as a substitute for another, and keep that conclusion within the arrangement’s stated scope.
- What do the token rules govern? Distinguish programmable use or transfer rules from the legal effect of a transfer.
- What do the governing documents say? Look for the identity of the party the holder has a claim against, the relationship between the token and any backing asset, and any stated rights. Do not infer ownership or redemption merely from interchangeability.
- What remains outside the token record? For a unique token associated with an asset or content, consider whether contractual terms, applicable law, or external systems also affect the associated rights.
Fungibility is therefore a narrow but useful classification: it tells readers whether units are designed to be substitutes within a defined context. It does not settle the separate question of what a holder owns or can enforce. For tokenized real-world assets, that question must be answered from the relevant arrangement and applicable law, not from token interchangeability alone.
Sources and references
- Tokenisation in the Context of Money and Other Assets — Committee on Payments and Market Infrastructures, Bank for International Settlements; retrieved 2026-10-19.
- Non-Fungible Tokens and Intellectual Property: A Report to Congress — United States Patent and Trademark Office and U.S. Copyright Office; retrieved 2026-10-18.
- Non-Fungible Tokens and Intellectual Property: A Report to Congress — United States Patent and Trademark Office and U.S. Copyright Office; retrieved 2026-10-18.
- Wholesale Digital Tokens — Committee on Payments and Market Infrastructures, Bank for International Settlements; retrieved 2026-10-19.